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 * Copyright (c) 2003-2008 Apple Inc. All rights reserved.
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 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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 * This file contains Original Code and/or Modifications of Original Code
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 * Version 2.0 (the 'License'). You may not use this file except in
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 * 
 * Please obtain a copy of the License at
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 * 
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#ifdef KERNEL_PRIVATE
#ifndef _I386_CPU_TOPOLOGY_H_
#define _I386_CPU_TOPOLOGY_H_

/*
 * This was originally part of cpu_threads.h.  It was split out so that
 * these structures could be referenced without pulling in all of the headers
 * required for the definition of cpu_data.  These data structures are
 * used by KEXTs in order to deal with the physical topology.
 *
 * NOTE: this header must stand on its own as much as possible
 * and not be dependent upon any unexported, kernel-private header.
 */

/*
 * Cache structure that can be used to identify the cache heirarchy.
 */
typedef struct x86_cpu_cache
	{
		struct x86_cpu_cache *next;		/* next cache at this level/lcpu */
		struct x86_die	*die;		/* die containing this cache (only for LLC) */
		uint8_t		maxcpus;	/* maximum # of cpus that can share */
		uint8_t		nlcpus;		/* # of logical cpus sharing this cache */
		uint8_t		type;		/* type of cache */
		uint8_t		level;		/* level of cache */
		uint16_t		ways;		/* # of ways in cache */
		uint16_t		partitions;	/* # of partitions in cache */
		uint16_t		line_size;	/* size of a cache line */
		uint32_t		cache_size;	/* total size of cache */
		struct x86_lcpu	*cpus[0];	/* cpus sharing this cache */
	} x86_cpu_cache_t;
	
#define CPU_CACHE_TYPE_DATA	1	/* data cache */
#define CPU_CACHE_TYPE_INST	2	/* instruction cache */
#define CPU_CACHE_TYPE_UNIF	3	/* unified cache */
	
#define CPU_CACHE_DEPTH_L1	0
#define CPU_CACHE_DEPTH_L2	1
#define CPU_CACHE_DEPTH_L3	2
	
#define MAX_CACHE_DEPTH		3	/* deepest cache */
	
	struct pmc;
struct cpu_data;
struct mca_state;

/*
 * Define the states that a (logical) CPU can be in.
 *
 * LCPU_OFF	This indicates that the CPU is "off".  It requires a full
 *		restart.  This is the state of a CPU when the system first
 *		boots or when it comes out of "sleep" (aka S3/S5).
 *
 * LCPU_HALT	This indicates that the CPU has been "halted".  It has been
 *		removed from the system but still retains its internal state
 *		so that it can be quickly brought back on-line.
 *
 * LCPU_NONSCHED	This indicates that the CPU is not schedulable.  It
 *		will still appear in the system as a viable CPU however no
 *		work will be sceduled on it.
 *
 * LCPU_PAUSE	This indicates that the CPU is "paused".  This is usually
 *		done only during kernel debug.
 *
 * LCPU_IDLE	This indicates that the CPU is idle.  The scheduler has
 *		determined that there is no work for this CPU to do.
 *
 * LCPU_RUN	This indicates that the CPU is running code and performing work.
 *
 * In normal system operation, CPUs will usually be transitioning between
 * LCPU_IDLE and LCPU_RUN.
 */
typedef enum lcpu_state
	{
		LCPU_OFF		= 0,	/* 0 so the right thing happens on boot */
		LCPU_HALT		= 1,
		LCPU_NONSCHED	= 2,
		LCPU_PAUSE		= 3,
		LCPU_IDLE		= 4,
		LCPU_RUN		= 5,
	} lcpu_state_t;

/*
 * In each topology structure there are two numbers: a logical number and a
 * physical number.
 *
 * The logical numbers represent the ID of that structure
 * relative to the enclosing structure and always starts at 0.  So when using
 * logical numbers, it is necessary to specify all elements in the topology
 * (ie to "name" a logical CPU using logical numbers, 4 numbers are required:
 * package, die, core, logical CPU).
 *
 * The physical numbers represent the ID of that structure and is unique (for
 * that structure) across the entire topology.
 *
 * The logical CPU structure contains a third number which is the CPU number.
 * This number is identical to the CPU number used in other parts of the kernel.
 */
typedef struct x86_lcpu
	{
		struct x86_lcpu	*next_in_core;	/* next logical cpu in core */
		struct x86_lcpu	*next_in_die;	/* next logical cpu in die */
		struct x86_lcpu	*next_in_pkg;	/* next logical cpu in package */
		struct x86_lcpu	*lcpu;		/* pointer back to self */
		struct x86_core	*core;		/* core containing the logical cpu */
		struct x86_die	*die;		/* die containing the logical cpu */
		struct x86_pkg	*package;	/* package containing the logical cpu */
		struct cpu_data	*cpu;		/* cpu_data structure */
		uint32_t		flags;
		uint32_t		cpu_num;	/* cpu number */
		uint32_t		lnum;		/* logical cpu number (within core) */
		uint32_t		pnum;		/* physical cpu number */
		boolean_t		master;		/* logical cpu is the master (boot) CPU */
		boolean_t		primary;	/* logical cpu is primary CPU in package */
		volatile lcpu_state_t	state;	/* state of the logical CPU */
		volatile boolean_t	stopped;	/* used to indicate that the CPU has "stopped" */
		uint64_t		rtcPop;		/* when etimer wants a timer pop */
		uint64_t		rtcDeadline;
		x86_cpu_cache_t	*caches[MAX_CACHE_DEPTH];
		struct pmc		*pmc;		/* Pointer to perfmon data */
		void		*pmStats;	/* Power management stats for lcpu */
		void		*pmState;	/* Power management state for lcpu */
	} x86_lcpu_t;

#define X86CORE_FL_PRESENT	0x80000000	/* core is present */
#define X86CORE_FL_READY	0x40000000	/* core struct is init'd */
#define X86CORE_FL_HAS_HPET	0x10000000	/* core has HPET assigned */
#define X86CORE_FL_HALTED	0x00008000	/* core is halted */
#define X86CORE_FL_IDLE		0x00004000	/* core is idle */
#define X86CORE_FL_WAKEUP	0x00002000	/* wakeup is pending */

typedef struct x86_core
	{
		struct x86_core	*next_in_die;	/* next core in die */
		struct x86_core	*next_in_pkg;	/* next core in package */
		struct x86_die	*die;		/* die containing the core */
		struct x86_pkg	*package;	/* package containing core */
		struct x86_lcpu	*lcpus;		/* list of logical cpus in core */
		uint32_t		flags;
		uint32_t		lcore_num;	/* logical core # (unique within die) */
		uint32_t		pcore_num;	/* physical core # (globally unique) */
		uint32_t		num_lcpus;	/* Number of logical cpus */
		uint32_t		active_lcpus;	/* Number of {running, idle} cpus */
		void		*pmStats;	/* Power management stats for core */
		void		*pmState;	/* Power management state for core */
	} x86_core_t;

#define X86DIE_FL_PRESENT	0x80000000	/* die is present */
#define X86DIE_FL_READY		0x40000000	/* die struct is init'd */

typedef struct x86_die
	{
		struct x86_die	*next_in_pkg;	/* next die in package */
		struct x86_lcpu	*lcpus;		/* list of lcpus in die */
		struct x86_core	*cores;		/* list of cores in die */
		struct x86_pkg	*package;	/* package containing the die */
		uint32_t		flags;
		uint32_t		ldie_num;	/* logical die # (unique to package) */
		uint32_t		pdie_num;	/* physical die # (globally unique) */
		uint32_t		num_cores;	/* Number of cores in die */
		x86_cpu_cache_t	*LLC;		/* LLC contained in this die */
		void		*pmStats;	/* Power Management stats for die */
		void		*pmState;	/* Power Management state for die */
	} x86_die_t;

#define X86PKG_FL_PRESENT	0x80000000	/* package is present */
#define X86PKG_FL_READY		0x40000000	/* package struct init'd */
#define X86PKG_FL_HAS_HPET	0x10000000	/* package has HPET assigned */
#define X86PKG_FL_HALTED	0x00008000	/* package is halted */
#define X86PKG_FL_IDLE		0x00004000	/* package is idle */

typedef struct x86_pkg
	{
		struct x86_pkg	*next;		/* next package */
		struct x86_lcpu	*lcpus;		/* list of logical cpus in package */
		struct x86_core	*cores;		/* list of cores in package */
		struct x86_die	*dies;		/* list of dies in package */
		uint32_t		flags;
		uint32_t		lpkg_num;	/* logical package # */
		uint32_t		ppkg_num;	/* physical package # */
		uint32_t		num_dies;	/* number of dies in package */
		void		*pmStats;	/* Power Management stats for package*/
		void		*pmState;	/* Power Management state for package*/
		struct mca_state	*mca_state;	/* MCA state for memory errors */
	} x86_pkg_t;

extern x86_pkg_t	*x86_pkgs;	/* root of all CPU packages */

typedef struct x86_topology_parameters
	{
		uint32_t		LLCDepth;
		uint32_t		nCoresSharingLLC;
		uint32_t		nLCPUsSharingLLC;
		uint32_t		maxSharingLLC;
		uint32_t		nLThreadsPerCore;
		uint32_t		nPThreadsPerCore;
		uint32_t		nLCoresPerDie;
		uint32_t		nPCoresPerDie;
		uint32_t		nLDiesPerPackage;
		uint32_t		nPDiesPerPackage;
		uint32_t		nLThreadsPerDie;
		uint32_t		nPThreadsPerDie;
		uint32_t		nLThreadsPerPackage;
		uint32_t		nPThreadsPerPackage;
		uint32_t		nLCoresPerPackage;
		uint32_t		nPCoresPerPackage;
		uint32_t		nPackages;
	} x86_topology_parameters_t;

/* Called after cpu discovery */
extern void		cpu_topology_start(void);

#endif /* _I386_CPU_TOPOLOGY_H_ */
#endif /* KERNEL_PRIVATE */
